Which type of valve is typically used for on/off applications without throttling?

The gate valve is specifically designed for on/off applications, making it ideal for situations where the flow of fluid needs to be fully stopped or allowed. This type of valve operates by lifting a gate or wedge out of the path of the fluid, which results in minimal obstruction to the flow when the valve is fully open.

Gate valves are not suitable for throttling applications because their design does not allow for precise control of flow rates. The flow characteristics during partial opening can lead to issues such as turbulence and increased wear on the valve components. In contrast, even though other types of valves, like globe valves or ball valves, can be used for on/off purposes, they are more suited for throttling control. Globe valves are specifically advantageous for throttling as they have a design that allows for better flow regulation, and ball valves, while also capable of on/off control, tend to be used for quick operation and can maintain a positive shut-off rather than for strict throttling. Check valves serve a different function entirely by allowing fluid to flow in one direction and preventing backflow, rather than controlling the flow at all.

Thus, the gate valve stands out as the ideal choice for applications that require straightforward, binary control of flow without the need for regulation.